package/gstreamer1: Allow to build OpenJPEG plugin
The OpenJPEG library is packaged in buildroot (version 1) and there is a
plugin "openjpeg" using it in gst1-plugins-bad. This commit add the option
for building this plugin. It provide a JPEG2000 encoder and decoder.
[Peter: use 'select' instead of 'depends on', sort alphabetically] Signed-off-by: Vincent Dehors <vincent.dehors@openwide.fr> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>